<!DOCTYPE html>
<html><head>
    <meta charset="utf-8">
</head>
<body>

<div onmouseover="mOver(this)" onmouseout="mOut(this)" style="background-color:#D94A38;width:120px;height:20px;padding:40px;">Mouse Over Me</div>

<script>
    function mOver(obj)
    {
        obj.innerHTML="鼠标进入"
    }

    function mOut(obj)
    {
        obj.innerHTML="鼠标离开"
    }
</script>

</body>
</html>